Support scaling haptic data in HapticGenerator

Move function of scaling haptic data from AudioMixer to vibrator
library. Scaling haptic data in HapticGenerator according to the haptic
intensity.

Bug: 136490803
Test: play audio-coupled-haptic files
Test: play audio with HapticGenerator effect
Change-Id: I6bac63c085332ea87cc6612a8f2f368ad7ef7826
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index fde583c..136ae98 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -399,7 +399,7 @@
             return ret;
         }
     }
-    return AudioMixer::HAPTIC_SCALE_MUTE;
+    return static_cast<int>(os::HapticScale::MUTE);
 }
 
 /* static */